Looks like the FCKEditor changed the behavior. You can see it here: http://www.bugnetproject.com/Forums/t...
You can fix this by changing this line of the web.config file:
<add name="FckHtmlEditorProvider" type="BugNET.Providers.HtmlEditorProviders.FckHtmlEditorProvider, BugNET.Providers.FckHtmlEditorProvider" Height="250" Width="100%" ToolbarSet="Default" Skin="Silver" BasePath="FCKEditor/"/>
The BasePath, in your case, should be something like BasePath="/BugNET/FCKEditor/".
Hope it helps.
Bye.
Edoardo.